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I have no idea on time line, but as I recall the early fixed sight Mark III models like the Official Police Mark III had narrow Service type hammers and triggers.
The trigger was narrow and I "think" grooved, the hammer was narrow and grooved instead of checkered.
In order to simplify production this started changing at some point, first the hammer was changed to the wider checkered type, then the narrow Service type trigger was changed to wide.
 
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